Piston clamp



R. c. ZANON.

PISTON CLAMP.

, APPLICATION FILED NOV-15, 1921- 1,432,008. Patented Oct. 117; 1922.

INVENTOR. Remo C. Z I

' ATTORNEY Patented Oct. 17, 1922.

are

REMO C. ZANON, F MODESTO,'CALIFORI\TIA, ASSIGNOR OF ONE-HALF TO JOHN 3'.

BERLIN, OF MODESTO, CALIFORNIA.

PISTON CLAMP.

, Application filed November 15, 1921. Serial No. 515,325.

- This invention relates to improvements in portable and hand-operated clamps, and particularly to a type intended to clamp gasengine pistons and similar cylindrical bodies, the principal object of my invention being to provide a clamp of this character which will firmly grip a piston at both ends, and without the possibility of distorting the piston or marring the surface of the same.

Another object is to provide a clamp so designed that a single size may be used to hold pistons of various sizes, both as to length and diameter, within reasonable limits.

A further object is toso design the clamp that it is a symmetric-ally formed and portable unit, adapted to be held by the hands at both ends, to allow of any work necessary being done on the piston, particularly as regards reaming or reboring the piston-pin bore or bushin A further 0%ject of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effectlve for the purpose which it is designed.

These objects I accomplishby means of such structure and relative arrangement of parts as will fully appear by a persual of the following specification and claims.-

In the drawings similar characters of reference indicate corresponding parts in the several views.

Fig. 1 is a side elevation of my improved clamp, showing a piston held thereby.

Fig. 2 is a similar view, one of the clamp members beingin section and reversed in position.

Fig. 3 is an enlarged fragmentary cross section taken on a line 33 of Fig. 2.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 denotes an endless frame or yoke, preferably of a shape to outline a rectangular area.

Fixed inside one end of the frame is a hollow member 2, frusto-conical in shape both lnside and out, held against longitudinal or rotative movement relative to the frame, while at the other end of the frame 60 is a similarly shaped member 3, which may be reversed in position with respect to the 'member 2, and is slidably lengthwise of the frame, being held against rotation by reason of the opposed edges of the member 3 being grooved as at 3 to embrace the transverse edge-flanges 1 of the frame.

Threaded through the frame 1 at the end thereof adjacent the cone 3 and in axial al inement therewith is a screw 4 provided wlth a handle 5 on its outer end, this screw passlng through the cone 3, and being rotatable therein, but held against longitudinal movement relative thereto. A nut 6 on the inner end of the screw member 4 holds the latter against withdrawal from the cone 3, but when it is desired to reverse the setting of the cone, it is only necessary to remove the nut, slide the cone away from the contact with the screw, and then move it slantwise so that the grooves 8 will be disengaged from the frame, permitting the cone to be withdrawn and set back in a reverse position.

A handle 7 similar in form and size to the handle 5 and in axial alinement therewith and with the cones, projects from the opposite end of the frame, or beyond the cone 2, so that the weight of the device is balanced along the'line of the handles.

In practice, for use with ordinary pistons which are chamfered just inside their lower edge, the clamp is set as in Fig. 1, the cones being spread apart a distance sufficient to enable the head end of the piston being placed in the cone 2, the. cone 3 being then movedtoward the piston by manipulation of the screw until the outer face of the said cone fits into and firmly grips the inner surface of the lower end of the piston. Since the cones are machined or finished both inside and out, and the engaged surface of the piston are likewise trued up, the cones will grip the piston at all points of the engaging peripheries, without chance of slipping and without any possible distortion of the piston no matter how tight the, screw may be.

turned.

If the piston is of a type unfinished on its inner surface, the cone 3 is reversed so that its inner surface will then engage the outer surface of thepiston, which is always machined.

The clamp, with the piston firmly held in its grip, may then be grasped by both hands and brought into. position for a drill or reamerto engage the piston-pin bore, without danger of the piston slipping;

I have shown the frame 1 as being endless, the eXtra bar over what is employed in the usual U-shaped clamp-framenot-only giving additional strength, but giving a more-even bearing. for thecones than would otherwise be had without unwieldy proportions of sundry parts.

I have also. specified the clamp-asbeing. used particularly. to hold pistons, but it is evident that it may be used to hold any cylindrical bodies which may require work of.

is tions from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.-

Having thus described my invention,what

. I- claim. as new and useful and desire to secure-by Letters Patent, is 2-- 1. A clamp for cylindrical bodies comprising a yoke-frame, and a pair of opposed clam members mounted in the frame at opposite ends thereof, said members being fmlsto-conically recessed, whereby the tapered; surfaces may engage the outer surface of; a cylindrical object.

2. Aclamp for cylindrical bodies comprising a yoke-frame, and apair of opposed clamp members .mounted in the, frame at opposite ends thereof, said members being frusto-conically recessed, and means for altering the distance between said members while preventing rotation thereof,

3. A clamp for cylindrical bodies comprising a yoke-frame, and a pair of opposed clam members mounted in the frame at opposite. ends thereof, said members being frusto-conically recessed, and one of said members being similarly shaped on its outer surface.

4-1%. clamp for cylindrical bodies comprising a yoke-frame, and a pair of opposed clamp members mounted in the frame at opposite ends thereof, said members bein frusto-conicallyrecessed, and one of sai members being similarly shaped on its outer surface, and means whereby the latter member maybereversed in position.

5. A clamp. for cylindrical bodies comprising a yoke-frame, and a pair of opposed clamp members mounted in the frame at opposite ends thereof, said membersbeing frusto-conically recessed and meansfor moving one of said members lengthwise of the frame'while holding-it againstrotation.

6. A clamp for cylindrical bodies comprising a yoke-frame, and a pair of opposed .clamp members mounted in the frame at opposite ends thereof, said members being frusto-conically recessed, and handles pro 'jecting from the opposite ends of the frame.

7. A clam for cylindrical bodies comprising a yoke-frame, and a pair of opposed clamp members mounted in the frame at opposite ends thereof, said members being frusto-conioally recessed, and handles proj ecting from the oppositeends of the frame, said handles being-in axial alinement with each other and. with the clamp members.

8. A1 clamp for cylindrical bodies comprising a yokeframe, and a pair of opposed clamp members mounted inthe frame at opposite'ends thereof, said members being frusto-conically recessed, handles pro 'jecting .fromthe opposite ends of the frame,

said handles being in axial alinement with the clamp members, and means betweenone of said handles and the adjacent clamp member for moving. the latter lengthwise of the frame, and means for preventing rotationof the clamp member at all times.

9. A. clamp for cylindrical bodies comprising a yoke-frame,- and a pair of opposed clamp members mounted in the frame at opposite ends thereof, said members being frusto-conically recessed, handles projecting from the opposite ends of the frame, one of said handlesbeing turnably mounted, and means for'moving the adjacent clamp member lengthwise of the frame with the rotation of the handle" while preventing the clamp member from such rotation.

10.'A" gas-enginepiston clamp comprising a frame, a taper-bored clamp member at one end adapted to receive the lower end of the piston therein, and a screw threaded having a pair of parallel arms, a pair of through the opposite end of the frame in opposed clamp members mounted therein, axial alinement With the clamp member and the arms passing outside the clamp mem- 10 provided With a taper point at its inner end bers and handles projectin from both ends 5 adapted to seat in the center socket in the of the frame beyond the 0 amp members.

head of the piston. In testimony whereof I aiiix my signature. 11, A clamp comprising a yoke frame REMO C. ZANON. 

